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net/llc/llc_output.c
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// SPDX-License-Identifier: GPL-2.0-only |
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/* * llc_output.c - LLC minimal output path * * Copyright (c) 1997 by Procom Technology, Inc. * 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br> |
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*/ #include <linux/if_arp.h> |
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#include <linux/netdevice.h> |
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#include <linux/skbuff.h> |
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#include <linux/export.h> |
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#include <net/llc.h> #include <net/llc_pdu.h> /** * llc_mac_hdr_init - fills MAC header fields * @skb: Address of the frame to initialize its MAC header * @sa: The MAC source address * @da: The MAC destination address * * Fills MAC header fields, depending on MAC type. Returns 0, If MAC type * is a valid type and initialization completes correctly 1, otherwise. */ |
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int llc_mac_hdr_init(struct sk_buff *skb, const unsigned char *sa, const unsigned char *da) |
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{ |
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int rc = -EINVAL; |
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switch (skb->dev->type) { |
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case ARPHRD_ETHER: |
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case ARPHRD_LOOPBACK: rc = dev_hard_header(skb, skb->dev, ETH_P_802_2, da, sa, skb->len); if (rc > 0) rc = 0; |
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break; |
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default: |
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break; |
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} return rc; } /** * llc_build_and_send_ui_pkt - unitdata request interface for upper layers * @sap: sap to use * @skb: packet to send * @dmac: destination mac address * @dsap: destination sap * * Upper layers calls this function when upper layer wants to send data * using connection-less mode communication (UI pdu). * * Accept data frame from network layer to be sent using connection- * less mode communication; timeout/retries handled by network layer; * package primitive as an event and send to SAP event handler */ int llc_build_and_send_ui_pkt(struct llc_sap *sap, struct sk_buff *skb, unsigned char *dmac, unsigned char dsap) { int rc; llc_pdu_header_init(skb, LLC_PDU_TYPE_U, sap->laddr.lsap, dsap, LLC_PDU_CMD); llc_pdu_init_as_ui_cmd(skb); rc = llc_mac_hdr_init(skb, skb->dev->dev_addr, dmac); |
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if (likely(!rc)) |
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rc = dev_queue_xmit(skb); |
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else kfree_skb(skb); |
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return rc; } EXPORT_SYMBOL(llc_mac_hdr_init); EXPORT_SYMBOL(llc_build_and_send_ui_pkt); |